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Compensted Spoke for Superconductor Rotor

Publishing Venue

The IP.com Prior Art Database

Abstract

In a high temperature superconductor rotor, it was previously proposed to use a spoke between the free end of the pole support structure and the warm end of the torque tube to control natural frequencies of the cold mass.

Country

United States

Language

English (United States)

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Compensated Spoke for Superconductor Rotor

In a high temperature superconductor rotor, it was previously proposed to use a spoke
between the free end of the pole support structure and the warm end of the torque tube to
control natural frequencies of the cold mass as shown below (see Figure 1):

Figure 1: Proposed topology with a conical torque tube and spoke

This approach has the added advantage of allowing the torque tube to be made of SS 304
which is readily available and cost effective. The torque tube would be made of two
sections, a thin section between the spoke and cold flange and a thicker section between
the spoke and its warm flange (the thick section is not shown). The spoke not only would
increase the natural frequency of the breathing and lateral mode of the cold mass but also
transfer some of the shock loads to the thick section of the torque tube.

Here, we have to have a strategy to reduce the conductive heat load associated with the
spoke and prevent loss of spoke pre load due shrinkage of pole support structure. This is
achieved by means of Belleview washers and G10 blocks as show below (See Figure 2):

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Page 2 of 2

Figure 2: A close up view showing the Belleview washer, G10 block, spoke, outer ring
and pole support structure.

This approach has the added advantage of accommodating manufacturing tolerances
associated with out of roundness of pole support structure.